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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbad9274403e4b0a15673289ca343c3d623b0aeeaf74df2b71b422f17c21639f' 
  AND token = 'GdWT6/NxX68l44IQlf3dXENhAgmBqT0r2cyyAwpM1v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}